Tricycle frame



FIG. 1 is a front and left side perspective view of a tricycle frame showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a rear and right side perspective view thereof.

The broken lines in the drawings illustrate portions of the tricycle frame and environmental structures that do not form part of the claimed design. 

CLAIM The ornamental design for a tricycle frame, as shown and described. 